(BERNE) - A Fort Wayne man who pleaded guilty in a plot to rob members of an Amish community has been sentenced to 15 years in prison.

18 -year-old Alejandro Lopez was sentenced Thursday to 20 years in prison, with five years suspended and to be served on probation. The Journal Gazette reports that Lopez had pleaded guilty to conspiracy to commit robbery, armed robbery, attempted armed robbery and criminal confinement.

He was arrested in September along with a 19-year-old man, a 16-year-old boy and his 43-year-old mother after a series of attacks on Amish residents in Adams County.

Court documents allege they used gas masks and baseball bats and cruised through rural areas near the town of Berne. They allegedly targeted four horse-drawn buggies in a series of robberies and attacks.